Allegra X22R

Hi Guri,

The rotor sensor connects to the tach board on the bottom of the motor, which connects to the display board, which has a ribbon cable to the converter. Make sure the correct rotor code is keyed in, then check the gap between the rotor and sensor with some compressible material like wax or putty.

Jeff

I have replaced the rotor ID sensor and have already verified that the rotor code is correct. The cable from the rotor ID sensor goes directly to the display board. My question is for the allegra X22R. Does anyone know what the gap is between the rotor and the sensor? Is the signal being processed on the display board or is it looped through to the frequency converter. I'm trying to figure out what else could cause the error 98 to come up.  

Guri

Sorry, 0.6 - 0.8mm gap. The manual is posted now on MedWrench (http://www.medwrench.com/?equipment.view/equipmentNo/556/Beckman-Coulter/Allegra-X-22/). Weak or missing rotor magnets could be a possibility; do you have another rotor to try? I'm sorry, I don't know about the signal processing. Post on MedWrench, there are some Beckman-experienced folks there that may be able to help further.

There was never any adjustment to the rotor ID assembly gap.  It just worked based upon the design of the centrifuge.  You can try using the service mode that is described in section 3 of the service manual the LabWrench has online.  Use the section that shows you the sensor status so that you can monitor what the rotor ID sensor is doing as you SLOWLY rotate the rotor assembly.  If you see activity of the sensor then that is a good thing.  It tells you that at least the sensor is seeing some change relative to the rotation of the rotor.  Whether or not that change truly reflects the correct rotor code is another issue altogether as service never received a chart illustrating the correct rotor patterns for each rotor manufactured for the X22 series of centrifuge.  There is also a part of the service mode that allows you to clear the error history.  Sometimes that has helped with clearing out the problem.  There is alos a mode that totally wipes the settings out and allows you to start from scratch but I don't recommend it.

Bad rotor magnets actually do happen over time.  How old is the rotor that you are using?  If it's not too old then it may be able to be repaired, possibly under warranty, by Beckman Coulter.

Don

Thanks Don. You're the Beckman guy I was referring to, thanks for filling in the details.

Jeff

As usual you guys always come through with the right answers. Thank you Jeff and Don.

So it was the magnets after all?